<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--准备好一个“容器”-->
<div id="test"></div>

<!--引入react核心库-->
<script type="text/javascript" src="../js/react.development.js"></script>
<!--引入react-dom，用于支持react操作DOM -->
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<!--引入babel，用于将jsx转为js -->
<script type="text/javascript" src="../js/babel.min.js"></script>

<script type="text/javascript" src="../js/prop-types.js"></script>

<script type="text/babel">
    //创建组件
    class Demo extends React.Component {
        // React.createRef调用后可以返回一个容器，该容器可以存储被ref所标识的节点,该容器是“专人专用”的
        myRef = React.createRef()
        myRef2 = React.createRef()

        showData = (event) => {
            console.log(event, 'showData event')
            console.log(event.target.value)
            console.log(this.myRef.current.value)
            alert(this.myRef.current.value)
        }
        showData2 = (event) => {
            console.log(event, 'showData2 event')
            alert(event.target.value)
        }

        render() {
            return (
                <div>
                    <input ref={this.myRef} type="text" placeholder="点击按钮提示数据"></input>
                    <button onClick={this.showData}>点我提示左侧的数据</button>
                    <input onBlur={this.showData2} type="text" placeholder="失去焦点提示数据"></input>
                </div>
            )
        }
    }

    //2.渲染组件到页面
    ReactDOM.render(<Demo a="1" b="2"></Demo>, document.getElementById('test'))
</script>
</body>
</html>

